Flue-gas denitration catalyst incapable of being deactivated by basic metallic oxides, preparation method thereof and applications thereof

A technology for denitrification catalysts and oxides, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of catalyst alkali metal oxide poisoning, etc., and achieve suitable production and high resistance to alkali metals Effects of oxide poisoning and avoidance of alkali metal oxide poisoning

Inactive Publication Date: 2014-06-18
SHANGHAI LANGT ELECTRIC POWER ENVIRONMENTAL PROTECTION TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a flue gas denitrification catalyst resistant to alkali metal oxide poisoning and its preparation method and application. By adopting the technical scheme of adding heteropolyacid in the preparation process of the flue gas denitrification catalyst, it is better to solve the problem of In the process of flue gas denitrification, the problem of catalyst alkali metal oxide poisoning can be widely used in flue gas such as power plants, industrial boilers, incinerators and cement kilns that use biomass as fuel and contain a large amount of alkali metal oxides in the flue gas. During the denitrification process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1. Preparation of honeycomb flue gas denitration catalyst monomer

[0049] The weight percent of each material in the catalyst described in the present embodiment consists of: nanoscale anatase titanium dioxide 80%, V 2 o 5 1%, 12-tungstophosphoric acid 10%, glass fiber 5% and diatomaceous earth 4%.

[0050] The weight of the hydroxypropyl methylcellulose added in the preparation process and titanium dioxide, V 2 o 5 , 12-tungstophosphoric acid, the ratio of the total weight of glass fiber and diatomaceous earth is 0.02:1, the weight of the added ethylene glycol and titanium dioxide, V 2 o 5 , 12-tungstophosphoric acid, the total weight ratio of glass fiber and diatomaceous earth is 0.03:1.

[0051] The preparation method of this catalyst mainly comprises following four steps:

[0052] (1) Loading of active components

[0053] Dissolve oxalic acid in 600g of distilled water to prepare a 2mol / L oxalic acid solution, dissolve 38.61g (0.33mol) of ammonium metavanad...

Embodiment 2

[0067] This embodiment is the same as embodiment 1, the difference is:

[0068] (1) The weight percent of each substance in the catalyst described in this embodiment consists of: nano-scale anatase titanium dioxide 77.5%, V 2 o 5 1.5%, 12-tungstosilicate 13%, glass fiber 4% and diatomaceous earth 4%. The weight of methyl cellulose added in the preparation process and titanium dioxide, V 2 o 5 , 12-tungstosilicic acid, glass fiber, the ratio of the total weight of diatomaceous earth is 0.02:1, the weight of the ethylene glycol that adds and titanium dioxide, V 2 o 5 , 12-tungstophosphoric acid, glass fiber, and diatomaceous earth in a total weight ratio of 0.02:1.

[0069] (2) During the loading process of the active components, firstly bake at 400°C for 5h, then at 550°C for 6h.

[0070] (3) During the loading process of heteropoly acid, dry at 80°C for 32h, calcinate at 250°C for 12h, and then calcinate at 350°C for 8h.

[0071] (4) During the molding process of the c...

Embodiment 3

[0079] This embodiment is the same as embodiment 1, the difference is:

[0080] (1) The weight percent of each substance in the catalyst described in this embodiment consists of: 70% of nanoscale anatase titanium dioxide, V 2 o 5 3%, 12-molybdophosphoric acid 15%, glass fiber 7%, bentonite 5%. The weight of carboxymethyl cellulose added in the preparation process and titanium dioxide, V 2 o 5 , 12-tungstosilicic acid, glass fiber, the ratio of the total weight of diatomaceous earth is 0.01:1, the weight of the added glycerin and titanium dioxide, V 2 o 5 , 12-tungstophosphoric acid, glass fiber, and diatomaceous earth in a total weight ratio of 0.01:1.

[0081] (2) During the loading process of the active components, firstly bake at 300°C for 10h, then at 500°C for 8h.

[0082] (3) During the loading process of heteropoly acid, dry at 40°C for 48h, calcinate at 300°C for 8h, and then calcinate at 300°C for 6h.

[0083] (4) During the molding process of the catalyst, it...

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Abstract

The invention discloses a flue-gas denitration catalyst incapable of being deactivated by basic metallic oxides, a preparation method thereof and applications thereof. The catalyst comprises following components by weight: 70-85% of nanometer titanium dioxide, 1-3% of V2O5, 5-15% of heteropoly acid, 3-15% of glass fiber and 4-10% of an inorganic binder. In the preparation method, active components and the heteropoly acid are loaded step by step. The catalyst has high denitration performance and high performance of resistance to deactivation by the basic metallic oxides, and is particularly suitable for flue gas denitration of a power plant, an industrial boiler, an incinerator, a cement kiln, and the like, wherein the power plant, the industrial boiler, the incinerator, the cement kiln, and the like adopt biomass as fuel and contain a large amount of basic metallic oxides in flue gas.

Description

technical field [0001] The invention relates to the field of environmental protection and environmental protection catalytic materials, in particular to a flue gas denitrification catalyst resistant to alkali metal oxide poisoning, a preparation method and application thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants, mainly NO, NO 2 It can not only cause environmental problems such as acid rain, photochemical smog and ozone depletion, but also seriously endanger human health. Therefore, how to effectively reduce NO x Emissions have become an important topic of global concern in the field of environmental protection. [0003] Ammonia selective catalytic reduction technology (Selective Catalytic Reduction, SCR) is currently the most widely used flue gas denitrification technology suitable for static sources such as power plants, industrial boilers and incinerators, and the catalyst is the core and key of the entire SCR system....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/199B01J23/22B01J23/30B01D53/86B01D53/56
Inventor 焦雪静姜瑞霞张现龙张蓓周坚刚
Owner SHANGHAI LANGT ELECTRIC POWER ENVIRONMENTAL PROTECTION TECH
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